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Division Spotlight
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver Downtown
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Nuclear Technology
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Latest News
TerraPower begins U.K. regulatory approval process
Seattle-based TerraPower signaled its interest this week in building its Natrium small modular reactor in the United Kingdom, the company announced.
TerraPower sent a letter to the U.K.’s Department for Energy Security and Net Zero, formally establishing its intention to enter the U.K. generic design assessment (GDA) process. This is TerraPower’s first step in deployment of its Natrium technology—a 345-MW sodium fast reactor coupled with a molten salt energy storage unit—on the international stage.
William T. Sha
Nuclear Technology | Volume 1 | Number 6 | December 1965 | Pages 538-545
Technical Paper | doi.org/10.13182/NT65-A20580
Articles are hosted by Taylor and Francis Online.
The effective resonance temperature (Teff) correlation of UO2 pellets based on experimental power coefficient data from PWR cores, namely, YANKEE, SAXTON, BR-3, and SELNI, is presented. The correlation can predict the total power defect of reactivity from hot zero power to full power within experimental uncertainties and Teff at any power level within ± 80°F (± 45°C), a magnitude which constitutes no more than ± 6% of the value at full power for current PWR design. With the ± 80°F uncertainty in Teff, the magnitude of the power coefficient of reactivity can vary as much as ± 30% in the low power region and ± 20% in the high power region. This study indicates the temperature drop in the gap between the pellet and clad is much lower than the value calculated for it in the past.
